What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) While maneuvering over the water, the pilot privacy data omitted heard a bang and lost power. He was unable to perform a successful autorotation and deploy the floats in time. The aircraft impacted the water at a relatively high speed and flipped over. Boeing safety investigator privacy data omitted and rolls royce investigator privacy data omitted analyzed and inspected the wreckage. Allison engine N1 did not rotate when spline shaft turned on starter generator pad. Engine had internal disconnect. Engine removed and sent to allison engine division. Awaiting final report to be included in accident folder.
As the FAA filed it
(-23) WHILE MANEUVERING OVER THE WATER, THE PILOT ^PRIVACY DATA OMITTED^ HEARD A BANG AND LOST POWER. HE WAS UNABLE TO PERFORM A SUCCESSFUL AUTOROTATION AND DEPLOY THE FLOATS IN TIME. THE AIRCRAFT IMPACTED THE WATER AT A RELATIVELY HIGH SPEED AND FLIPPED OVER. BOEING SAFETY INVESTIGATOR ^PRIVACY DATA OMITTED^ AND ROLLS ROYCE INVESTIGATOR ^PRIVACY DATA OMITTED^ ANALYZED AND INSPECTED THE WRECKAGE. ALLISON ENGINE N1 DID NOT ROTATE WHEN SPLINE SHAFT TURNED ON STARTER GENERATOR PAD. ENGINE HAD INTERNAL DISCONNECT. ENGINE REMOVED AND SENT TO ALLISON ENGINE DIVISION. AWAITING FINAL REPORT TO BE INCLUDED IN ACCIDENT FOLDER.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.